Anti-friction bearing for pulley-blocks



(No Model.)

T. 8. PERBALL.

ANTI FRIGTION BEARNG FOR PULLEY BLOCKS. 1810.858028. 1288811888 Feb.22,1887.

v 2 '?\l I VVITNEESEE- INVENTUR.

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UNITED STATES PATENT OFFICE.

THOMAS R. FERRALI., OF BOSTON, MASSACHUSETTS.

ANTI-FRICTION BEARING FOR PuLLEY-BLOCKS.

SPECIFICATION forming part oi' Letters Patent No. 358,028, dated February 22, 1887.

Application filed April 1G, 18E6.

To all whom, t may concern.-

Be it known that I, THoMiis R. FERRALL, a citizen of the United States, residing at Bos ton, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Anti-Friction Bearings; and I do hereby declarethat the saine are fully described in the following specification and illustrated in the accompanying drawings.

This invention relates to improvements in anti-friction bearings, and it is particularly Well adapted for pulley-blocks, although it is equally useful for other purposes where an anti-friction device is needed.

The invention is carried out as follows, reference being had to the accompanying drawings, where- Figure 1 represents a longitudinal section, and Fig. 2 represents a cross-section, of a singlesheave pulley-block provided with my improved antifriction bearing. Fig. 3 represents a longitudinal section of the saine as applied to a double or multiple block. Fig. 4 represents a perspective detail view of the box and its anti-friction cylinder.

Similar letters refer to similar parts wherever they occur on the different parts of the drawings.

In Figs. 1 and 2 is represented a single` sheave pulley-block, in which a c are the sides, and b -b the end pieces, as usual.

c is the metal bow-strap, secured to the sides a c by means of the box D, passing through 'perforationsin said sides and metal bow-strap c.

The box D is made of metal, with a semicircular, or nearly so, recess, D', extending nearly throughout its whole length, and having solid ends d and d', as shown in the drawings, one of which may be made square or polygonal,or of suitable shape, to fit a corresponding recess in one of the sides a, so as' to prevent the box from turning around when put in place with its recess D uppermost, as shown.

Within the recess Din box D is laid loosely the solid cylinder E, which is made of uniform size and shape throughout its length, so as to bear and lie on the entire recess D from one end to the other, said recess being therefore made of auniform size and shape through out its entire length, as shown.

F is the sheave, having a central perfora- Serial No. 199,058. (No model.)

tion, through which is looselyinscrted the box D and its cylinder E,as shown inFigs. 1 and 2.

By making the cylinder' E of uniform size and shape throughout its length without any reduced ends or journals, and sufficiently long to extend beyond the metal strap c and interior walls of the side pieces, aa, it will be seen that the downward strain on the sheave F is couveyed,through the medium of the uniform cylinder F, to the metal strap C and side pieces, a c, and thus relieving all breaking strain from the box D, which latter may/thereA fore be made very light, and preferably of gun` metal or suitable material. The upper portion of the central perforation in sheave F is made to rest on the upper surface of the cylinder E, and as the sheave is rotated it will roll on the cylinder E, that will be caused to revolve easily in the recess D'. I prefer to providethe recess D with a number of grooves or notches or channels, d d d, into which a suitable lubricant, paste, or liquid is placed, so as to keep the cylinder E and recess- D properly lubricated, by which arrangement a large amount of lubricating material can be placed in such grooves, Svc., to keep the recess Dl and its cylinder E properly lubricated for a great length of time. When the lubricant is consumed, the box D and cylinder E can eas ily be removed from the block and a fresh supply placed in said grooves d d.

When the device is to be used in double or multiple block, as shown in Fig. 3, I make a separate cylinder for each sheave on account of the variation in speed of the sheaves when the block is used, and I make a division-wall, d3, in the box D, so as to separate one cylinder from the other, as shown in Fig. 3.

This my device is very strong and durable, and is applicable as an anti-friction bearing for a variety of purposes besides sheaves and pulley-blocks. v

What I wish to secure by Letters Patent, and claim, isy l. In an anti-friction bearing, the sides or supports a a, the stationary box D, having a recess, D', ofcontinuous size, and end walls,d d, the roller E, of continuous size throughout its length, adapted to rotate in said recess, and the pulley F, having central perforation, in which the box D and roller Eare introduced,

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to permit the pulley to rotate on and around In testimony whereof I have affixed my sigio the roller E, combined as andfor the purpose nature in presence of two Witnesses.

set forth.

2. The cylinder E, of uniform size through- THOMAS R. FERRALL. 5 out its length, in combination with the box D,

having recess D, of uniform size,for receiving` Vitnesses: the cylinder E, the end walls, d d', and ehan- I ALBAN ANDRN, nels or grooves or notches el d, for holding HENRY CHADBOURN.

the 1ubrieant,as herein set forth and described. 

